A compound of the formula:
or a pharmaceutically acceptable salt or solvate thereof,
wherein
Y1 is NP2 or O;
P1 and P2 are independently hydrogen, acyl group or an amino protecting group;
R11 is hydrogen, acyl group or an amino protecting group, provided that -CO(CH2)3-CO2H, -Ph and -CH2Ph (Ph: phenyl) are excluded.
式中的化合物:
或其药学上可接受的盐或溶液、
其中
Y1 是 NP2 或 O
P1 和 P2 独立地为氢、酰基或
氨基保护基团;
R11 是氢、酰基或
氨基保护基团,但不包括-CO(
CH2)3-CO2H、-Ph 和 - Ph(Ph:苯基)。